Metallic fastener



y 2, 1929- H. ROSENBERG 1.719.137

METALLIC FASTENER Original Filed June 26. 1922 Pitente'd July 2, 19z9.

UNITED STATES-PATENT oar Ice.

Harman nosnnnnne, or new Yoaxjn. Y.

METALLIC FASTENER.

Original application and June as, 1922, Serial No. 570,912. Divided and this application mid-mama:

22, 1923. Serial N0. 682,268.

This invention relates to improvements in metallic fasteners, and more particularlyto the pin type adapted to be driven to the securing position, such, for instance, as is shown vin my co-pending application for United States Letters Patent Serial No. 57 O,- 912, filed June 26,- 1922, and of which this is a division.- 9

Among the objects in view is the efiicienti W anchorage of parts by a pin-like structure with the greatest posslble-facility and at the least expense.

With this and further objects in view as will in part hereinafter become apparent and in part be stated, the invention com-.

prises certain novel constructions, combinations and arrangements of parts as subsequently specified and claimed.

In the accompanying drawings, The figure is a view inside elevation of a metallic fastener embodying the features of 1 the present invention, on a'considerably magnified scale beyond the size of'the avera e commercial article.

Referring to t indicates the body" of a pin preferably formed with a drivin head 2 and provided with outstanding pro ections 3, 3, scattered about and projecting radially'from the surpreferably formed integral with the body, and are also preferably arranged in such relation to each other as to form rows arranged in lines corresponding with'the lines of high as pitched threads. The projections 3 may, of

- course, be otherwise arranged when preferred, and it is also 7 most projections 3 shall be spaced above the lower extremity .of the body 1 for leaving a pilot portion at such extremity.

Each projection 3 has fourslopingsides meeting at an apex, and forming incomplete outline the shape of a conventional diamond,

the'two lower inclined faces having a meeting edge forming an entering cutting edge. The upper sloping faces of each-projection 3 also meetin a corresponding edge which functions rinclpally only when an effort is made to withdraw the pin 1. The upper inclined surfaces provide an underhanging portion for cooperating with an overhanging portion of the material of the work produced by the flow of the metal as hereinafter mentioned. The upper cutting edge channel-like opening in the metal either the parts being shownthe delivery of blows on the head 2 e drawings by numerals, 1

face-of the body 1. The projections 3 are desirable that the lower-- I out injury to the projections.

like bod and the upper sloping faces of each of projections 3 render it possible tb withdraw the pin 1 after the same has been introduced into metal under the required withdrawing stress.

While pin 1 may thus be withdrawn, such the opening. As the projections -3 extend beyond the opening, the pin may be introduced into the material only-by being driven until the projections 3 enter thesurrounding metal, each of said projections formin causing the flow of the metal-or by cutting the metal. The driving of the pin may be accomplished in any knownmanner, [as by.

y an appropriate hammer. The usual action of each projection 3 is to' severthe metal and. then cause it to flow and during the flow of the metals; certain portion of it will flow back into the channel or groove cut by each projection 3 in position to overhang the projection 3; This overhanging portion cooperates to afford an effective resistance to the withdrawal of the pin.

.Each projection 3 is hardened to an extent sufficient for entering or cutting metal, such as soft iron-or soft steel, substantially with- The projections may be hardened by any well known process, such, for instance, as by case-hardening the entire fastener by the usual cyanide process.

What is claimed is':-

-' 1. A metallic fastener comprising a pinand a projection of substantially diamon shape in marginal outline, said projection outstanding from the body and being arranged with one of the acute angles of the diamond positioned generally in the direction of advance of the body when being driven into work.

2. A metallic fastener comprising a pinlike body and a series of projections each substantially diamond shape in marginal outlinefsaid projections outstanding from the body and being arranged in, a substanfour lane sides sloping both 10 'tudinally tially spiral alinement thereon. and l terally from a substantia ly central 3'. A metallic fastener c'om rising a pin point to an blending into the body. 10 like bod and a projection o substantially In testimony whereof I afiix my signa- 5 diamon shapein marginal outline, said proture.

' action beingof solid mass integral with the dy andoutstanding therefrom and having I ROSENBERG. 

